A:720万元,6元
B:720万元,5元
C:600万元,5元
D:600万元,6元
——What do you often do_______ classes to relax yourselves?——We often do eye exercises, listen to music or do some running around the school.
计算(9.6)0+lg25+lg4+7log72
从北京开往广州的列车对铁轨的磨损程度( )